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How To Upgrade Debian Etch To Lenny

"Debian Etch is soon to be unsupported by the Debian
team, therefore all Debian Linux Servers need to be upgraded to
Debian Lenny. I work for Netzen (an IT Support company) and have
upgraded many Linux servers to Debian Lenny over the past month, so
I am providing this guide on how to upgrade Debian Etch to Debian
Lenny to the HowtoForge community.

"Backup
Backup! I took a full backup of the server which is stored off the
server I am backing up of course! I also take an additional backup
of /etc which I store locally in /root this is just in case I make
a mistake during the the upgrade process and over write a config
file, or dpkg / aptitude makes a misstake some how and botches my
configs. Worth pointing out that none of these two things have
never happened, but “only the paranoid survive”.

"SSH / Screen
When I upgrade my servers remotely over SSH I always run the
upgrade in screen, that way if you lose connection to your server
you will still be able to reconnect to the screen session."